It is very easy to see that you've never heated a crank timing gear and
dropped it onto a freshly turned crank.
I'm outt'a this...............
You guys pick your nits alone.

Stan Wilder
http://www.engineceramics.com/

----- Original Message -----
From: "Daniel L. Katz" <katzd54@YAHOO.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, June 27, 2004 11:00 PM
Subject: Re: Hydro lifters (# of turn)

> yes, but the whole engine, including all the gaps and holes, expand with
> increasing temperature. if all the materials were the same, and the
> temperature was uniform throughout the engine, then the gap would expand
> by exactly the same percentage as the overall expansion of the engine; and
> there would be more than .006 lash. there might be a differential thermal
> expansion going on because of different materials and temperature
> differences, and maybe that is what is going on, but it is a little
> surprising.
>
> the idea is the same as heating a metal plate with a hole punched out. the
> plate and hole must expand by the same percentage. maybe the easiest way
> to prove that statement is to imagine also heating the piece that was
> punched out. it obviously exdpands, and should be just the right size to
> fit the expanded hole in the heated sheet.
>
> dan
>
> On Mon, 28 Jun 2004 10:19:53 -0500, Stan Wilder <wilden1-1@SBCGLOBAL.NET>
> wrote:
>
> >It's the heat that expands the steel parts.
> >The various parts just expand and consume that .006.
> >Various parts = Lifters, Rocker Arms, Valve Stems, Pushrods, valve seats.
> >Check out .006 on a feeler gauge, it's about 1/2 as thick as typing
paper.
> >
> >Stan Wilder
> >